586 STEWART: FLORA OF LADAK, WESTERN TIBET 
Hypecoum leptocarpum 
Corydalis crassifolia? 
stricta 
Lepidium capitatum 
Arabis tibetica 
Alyssum canescens 
Braya alpina 
Christolea crassifolia — 
Sedum tibeticum Stracheyi 
Sempervivum acuminatum 
Saxifraga Hirculus indica 
Potentilla tetrandra 
sé 
sericea 
Caragana pygmea 
Oxytropis densa 
. lapponica 
microphylla 
i tatarica 
Biebersteinia Emodii 
Pleurospermum stellatum 
Primula sibirica 
ae 
Gentiana aquatica 
Marrubium lanatum 
Nepeta longibracteata 
‘nivalis 
tibetica 
Dracocephalum heterophyllum 
Thymus Serpyllum 
Elsholizia pusilla 
Veronica ciliata? 
Rubia tibetica 
Galium pauciflorum 
Lonicera spinosa 
Aster heterochaeta 
“*  tibeticus 
Leontopodium alpinum 
Anaphalis nubigena 
Tanacetum fruticulosum 
Artemisia minor 
Senecio arnicoides frigida 
Werneria nana 
Saussurea bracteata 
glanduligera 
Taraxacum officinale 
- officinale parvulum 
6a 
NATIVE AND NATURALIZED SPECIES OF THE EASTERN UNITED 
STATES OCCURRING IN WESTERN TIBET 
In comparing the flora of Ladak with a distant flora like that 
of the eastern United States there are many more similarities 
than one would suspect and it is possibly worth while to make a 
list of species that are common to both countries. Plant lists do 
not, of course, give a picture of-a region, and the aspect of the 
two countries is absolutely different, but there are enough things 
similar to make an American feel somewhat at home. 
At least 140 of the plants of Ladak, which amount to about 
825 forms, occur here in America, too, but when one comes to 
examine them it appears that no less than 85 are weeds and not 
